Mount Carmel, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.1 °C (low) to 15.2 °C (high). Annual precipitation averages 1274.8 Millimeters. Mount Carmel is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.9 °C | 1.4 °C | 91.95 mm |
| February | -7.1 °C | 2.9 °C | 69.34 mm |
| March | -2.9 °C | 7.8 °C | 101.35 mm |
| April | 3.1 °C | 15 °C | 105.16 mm |
| May | 8.6 °C | 20.9 °C | 109.22 mm |
| June | 13.5 °C | 25.2 °C | 120.65 mm |
| July | 15.8 °C | 28.1 °C | 120.4 mm |
| August | 14.8 °C | 27.1 °C | 111.51 mm |
| September | 11.1 °C | 23.3 °C | 132.84 mm |
| October | 5.1 °C | 16.5 °C | 120.65 mm |
| November | -0.1 °C | 9.7 °C | 93.22 mm |
| December | -4.4 °C | 3.9 °C | 98.55 mm |
| Annual | 4.1 °C | 15.2 °C | 1274.84 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |